
grass color smoothing with hardware coloring?
dirt covered in grass?
stone cvered in grass?
stone covered in dirt?
greylands?  white-gray lands with red features

try to generate 2 mapchunks in one go
overgen only stone and dirt, not plants or grass blocks
tall grass noised cover
skip generation that are within layer but outside the the hightmap limits

make separate tree trunks placing them acording to terrain: flat or otherwise

add air above tree roots to avoid floating grass from original terrain
